US6118087A - Safety switch - Google Patents

Safety switch Download PDF

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Publication number
US6118087A
US6118087A US09/049,098 US4909898A US6118087A US 6118087 A US6118087 A US 6118087A US 4909898 A US4909898 A US 4909898A US 6118087 A US6118087 A US 6118087A
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United States
Prior art keywords
driving cam
actuator
cam
safety switch
recited
Prior art date
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US09/049,098
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English (en)
Inventor
Takao Fukui
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Idec Izumi Corp
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Idec Izumi Corp
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Priority claimed from JP11226097A external-priority patent/JPH10302580A/ja
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Assigned to IDEC IZUMI CORPORATION reassignment IDEC IZUMI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUI, TAKAO
Priority to US09/397,009 priority Critical patent/US6194674B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
    • H01H2027/005—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards the key receiving part having multiple openings to allow keys from different directions to operate the switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
    • H01H27/007—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards the switch being lockable by remote control, e.g. by electromagnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/06—Key inserted and then turned to effect operation of the switch

Definitions

  • the present invention relates to a safety switch which is mounted on the wall surface of a doorway of a room in which, for example, industrial machinery is installed, and which stops the power supply to the industrial machinery, etc. when the door of the doorway is opened.
  • a system for locking the drive of the machine is required to be installed when the door of the doorway in the room or a danger zone is not completely closed, in order to prevent troubles in which workers are caught in by the machine and injured.
  • the safety switch of this proposal is a switch which has a construction in which the special-purpose of the actuator fixed to the door enters the operating portion of the switch proper mounted to the wall surface in the circumference of the doorway of the room when the door of the doorway is closed, and with this action, the mobile contact of the contact block is changed over, and with this kind of change-over operation, the circuit connection is changed over to the main circuit side (power supply circuit to industrial machinery), causing the machines inside the room to be ready for operation.
  • the safety switch of this invention is a switch constructed to change over a connection contacts by the actuator entering the operating portion of the switch proper and moving the operating rod of the switch portion correspondingly, wherein the actuator has the inserting portion to the operating portion comprising a pressurizing piece at the tip end and a supporting piece for supporting the pressurizing piece, and to the pressurizing piece, are protruded portion pressurizing surfaces located on both ends and a recessed portion pressurizing surface located in-between.
  • a driving cam is installed that rotates as the actuator advances and retracts and restricting plates are located on both sides of the driving cam and are able to rotate around the rotation center of the driving cam, respectively, and a cam follower pin is connected to the end portion of the operating rod, whose both ends extend to the side of the driving cam.
  • a groove cam is formed for providing the cam follower pin with displacement in the moving direction of the operating rod, and to each of the restricting plates, a pin engaging portion is located on the moving passage of the cam follower pin under the initial condition where the actuator is not inserted and intended to restrict the move of the follower pin, and an elastic member is included for returning the restricting plates to the initial condition, respectively.
  • the motion at the operating portion can be prevented even if something other than the special-purpose actuator (for example, a screwdriver, etc.) is inserted into the insertion hole. That is, in the safety switch of this invention, because the driving cam rotates only when the driving cam and the restricting plates on both sides are pressed nearly simultaneously with the recessed portion pressurizing surface and the protruded portion pressurizing surfaces of the actuator, even if something with a flat tip end such as a screwdriver, etc. is inserted to the operating portion to rotate the driving cam, the movement of the cam follower pin is restricted by the pin engaging portion of the restricting plates when the driving cam slightly rotates, and thereby the rotation of the driving cam is prevented. In addition, because to the restricting plates, no groove cams, etc. for providing displacement to the cam follower pins are processed, even if they are rotated individually, they only idle and do not cause the operating rod to move.
  • the special-purpose actuator for example, a screwdriver, etc.
  • the safety switch of this invention may be configured to have the pin guide member equipped with a guide groove for restricting the moving direction of the cam follower pin to one direction on both ends of the cam follower pin.
  • the driving cam and restricting plates equipped on both sides of it are desirable to be rotatably supported on the same shaft independently, respectively.
  • the driving cam and the restricting plates are desirable to be arranged at locations that may generate, between the driving cam and the restricting plates under the initial condition, the rotating phase difference that corresponds to the level difference between the protruded pressurizing surfaces and the recessed pressurizing surface of the actuator.
  • the driving cam includes a hollowed-out portion extending in a specified width from the circumferential surface towards the rotation center of the driving cam formed on the portion corresponding to the groove cam formed portion, and the operating rod end portion is intended to be inserted into the hollowed-out portion, and to the rod end portion, the cam follower pin is connected.
  • the pin engaging portion to be equipped to the restricting plates in the safety switch of this invention includes a notch formed to a profile to which the cam follower pin fits in, and examples of the notch profile include a semi-circle or rectangle. Or, it may be configured to form a hole for relief of the cam follower pin to this restricting plates and to form the notch to the edge portion of the hole. Or the pin engaging portion of the restricting plate may be a hook-form engaging piece integrally formed on this restricting plate.
  • the elastic member for restoring the restricting plate to the initial condition it is desirable to use a torsion coil spring in view of achieving the simple construction, but configurations of providing the restoring force to the restricting plate using the elastic force of compression coil springs, tension coil springs, plate springs, etc. may be adopted.
  • plate springs it may be configured to integrally form this plate spring to the restricting plate.
  • driving cam and the restricting plates may be plastic moldings.
  • a lock mechanism for preventing pull-out of the actuator that has entered the operating portion and a lock canceling means that can cancel the locking mechanism may be installed, and in such event, when the actuator enters the operating portion and the connection contacts are changed over, the lock mechanism prevents the actuator from falling off and mechanically locks the door, etc. to prevent the door, etc. from opening.
  • the lock canceling means may be designed to be an automatic lock canceling mechanism that automatically cancels the lock mechanism of the actuator in response to the electrical signals from the outside, For example, if a mechanism utilizing the solenoid is applied, when the power supply to the industrial machinery is operated to be interrupted, the operation OFF signal excites the solenoid, automatically cancels the lock by the lock mechanism, and brings the door to be ready for opening.
  • a manual lock canceling mechanism for canceling the lock mechanism of the actuator by manual operation can be adopted, and specific examples include a mechanism for canceling the lock mechanism by key operation.
  • a mechanism for utilizing the lever can be mentioned.
  • a through hole reaching the inside of the operating portion may be formed on the fixing surface of the switch proper, and the lock canceling means may be operated via the through hole.
  • a lock canceling means may be such that both automatic lock canceling mechanism and manual lock canceling mechanism as described above are installed.
  • connecting a switch that is normally closed and is opened when the lock is canceled by the lock canceling means in series to the connection contact to the circuit to which the contacts of the switching portion are connected can further improve the safety.
  • the power supply to the industrial machinery, etc. indoors is intended to be interrupted only by switching operation of the connection contacts on the switch portion side
  • the power supply to the industrial machinery, etc. indoors can be interrupted when the door is opened, and the workers, etc. may enter the room when the inertia motion still remains in the machines.
  • the safety switch provided with a lock mechanism
  • since the actuator is unable to be pulled out, that is, the door is unable to be opened unless the lock mechanism is canceled and the operating portion is ready for operation in advance before the door is opened, connecting the connection contacts on the switch portion side to the switch installed on the lock canceling mechanism side in series can interrupt the power supply to the industrial machinery, etc.
  • FIG. 1 is a perspective view showing a first embodiment of the present invention under the applied condition
  • FIG. 2 is a plan view showing the configuration of the first embodiment of the present invention with a cover removed;
  • FIG. 3 is a side view showing the configuration of the first embodiment of the present invention with a cover partly broken away;
  • FIG. 4 is a plan view showing the configuration of the operating portion 111 of the first embodiment of the present invention with a cover removed;
  • FIG. 5 is a side view showing the configuration of the operating portion 111 of the first embodiment of the present invention with a cover partly broken away;
  • FIG. 6 is a center longitudinal sectional view of the operating portion 111 of the first embodiment of the present invention.
  • FIG. 7 (A) is a side view showing part of the driving cam 1 and the operating rod 8 used in the first embodiment of the present invention, and FIG. 7 (B) is the plan view;
  • FIG. 8 is a side view showing the restricting plates 2, 3 used in the first embodiment of the present invention.
  • FIG. 9 (A), (B), (C) illustrate the operation of the first embodiment according to the present invention, respectively;
  • FIG. 10 (A), (B), (C) illustrate the operation of the first embodiment according to the present invention in which a pressurizing plate D other than the special-purpose actuator 102 is used, respectively;
  • FIG. 11 (A), (B) illustrate the operation of the first embodiment according to the present invention in which a pressurizing plate D is used;
  • FIG. 12 is a side view showing a deformation example of the restricting plate used for the safety switch of the present invention.
  • FIG. 13 (A), (B) illustrate the operation of the first embodiment according to the present invention in which a compression coil spring is used for an elastic member, respectively;
  • FIG. 14 (A), (B) illustrate the operation of the first embodiment according to the present invention in which a tension coil spring is used for an elastic member, respectively;
  • FIG. 15 (A), (B) illustrate the operation of the first embodiment according to the present invention in which a plate coil spring is used for an elastic member, respectively;
  • FIG. 16 (A), (B) illustrate the operation of the first embodiment according to the present invention in which a plate coil spring and the restricting plate are integrally formed, respectively;
  • FIG. 17 is a perspective view of a second embodiment of the present invention under the applied condition.
  • FIG. 18 is a plan view showing a configuration of a second embodiment of the present invention with a cover removed;
  • FIG. 19 is a side view showing a configuration of a second embodiment of the present invention with a cover removed;
  • FIG. 20 is a plan view showing a configuration of the operating portion 211 and the solenoid mechanism portion 213 of a second embodiment of the present invention with a cover removed;
  • FIG. 21 is a cross-sectional view taken on the lines X--X of FIG. 20;
  • FIG. 22 (A), (B), (C) illustrate the operation of a second embodiment according to the present invention, respectively;
  • FIG. 23 (A) is a circuit block diagram where the door is closed
  • FIG. 22 (B) a circuit block diagram where the lock is canceled
  • FIG. 22 (C) a circuit block diagram where the door is closed in a second embodiment of the present invention, respectively;
  • FIG. 24 (A) is a plan view of a third embodiment according to the present invention and FIG. 24 (B) the side view;
  • FIG. 25 is a longitudinal cross sectional view of a third embodiment according to the present invention.
  • FIG. 26 (A), (B) illustrate operation of a third embodiment of the present invention
  • FIG. 27 (A) is a plan view of a fourth embodiment according to the present invention and FIG. 27 (B) the side view;
  • FIG. 28 is a longitudinal cross sectional view of a fourth embodiment according to the present invention.
  • FIG. 29 illustrates another example of a means for manually canceling the lock mechanism of the actuator
  • FIG. 30 illustrates an operation of the example in FIG. 29
  • FIG. 31 is a partial cross sectional view showing an example using a canceling lever which moves a small screw in the first embodiment of the present invention
  • FIG. 32 is a side view showing the first embodiment shown in FIG. 31 under the applied condition
  • FIG. 33 is a view on arrow Z in FIG. 32;
  • FIG. 34 is a perspective view showing the construction of the canceling lever 313 used in the first embodiment shown in FIG. 31;
  • FIG. 35 (A), (B) illustrates the operation of the canceling lever 313, respectively
  • FIG. 35 is a partial cross sectional view showing another example concerning the first embodiment shown in FIG. 31.
  • FIG. 1 is a perspective view of the first embodiment according to the present invention under the applied condition
  • FIG. 2 is a plan view showing the configuration of the first embodiment according to the present invention with the cover removed
  • FIG. 3 is a side view showing the configuration of the first embodiment of the present invention with a cover partly broken away.
  • the safety switch of this first embodiment is a switch electrically connected to the industrial machinery installed in a room, and primarily comprises a switch proper 101 and an actuator 102.
  • the switch proper 101 is secured at the wall surface in the periphery of the doorway of the room and the actuator 102 is secured at a door 103.
  • the actuator 102 is located at the position opposite to the insertion hole 101a of the switch proper and enters the operating portion 111 of the switch proper 101 when the door 103 is closed.
  • the entry of the actuator 102 changes over the connection contact of the contact block 9 built in the switch portion 112, and the machinery inside the room is ready for operation.
  • the actuator 102 is removed from the operating portion 111 by the opening of the door 103, the connection contact of the contact block returns to the original condition and the power supply to the machine is turned off.
  • the actuator 102 has the insertion portion to the operating portion 111 composed of a pressurizing piece 121 at the top end portion and a pair of supporting pieces 122, 123 for supporting both ends as shown in FIG. 1.
  • a pressurizing piece 121 at the top end portion and a pair of supporting pieces 122, 123 for supporting both ends as shown in FIG. 1.
  • protruded pressurizing surfaces 121b, 121b located on both end portions and a recessed pressuring surface 121a located in-between are formed.
  • FIG. 4 and FIG. 5 are a plan view and a side view, respectively, with the cover of the operating portion 111 removed.
  • FIG. 6 is a center longitudinal sectional view of the operating portion 111.
  • FIG. 7 (A) is a side view showing part of the driving cam 1 and the operating rod 8 fitted within a hollowed-out portion 600 in the driving cam 1
  • FIG. 7 (B) is the plan view
  • FIG. 8 is a side view extracting to show the restricting plates 2, 3.
  • a driving cam 1 is mounted to the center of the operating portion 111.
  • This driving cam 1 serves to provide displacement to the operating rod 8 of the switch portion 112, and is rotatably supported to the support frame 11 via a cam shaft 4.
  • a groove cam 1c is formed at the position opposite to the recessed portions 1a, 1b with the cam shaft 4 placed in-between, and to this groove cam 1c, a cam follower pin 6 is inserted.
  • Both ends of the cam follower pin 6 extend to the vicinity of the support frame 11, and both end portions are supported by the guide grooves 7a, 7a of the pin guide member 7, respectively.
  • Each of the guide grooves 7a, 7a serve to restrict the moving direction of the cam follower pin 6 to one direction, and is formed along the straight line which passes the center of the cam shaft and is parallel to the moving direction of the operating rod 8.
  • the end portion of the operating rod 8 is connected, and the connection contact of the switch portion 112 is changed over when the operating rod 8 advances and retracts as this cam follower pin 6 moves.
  • restricting plates 2, 3 are located, respectively.
  • a pair of right and left restricting plates 2, 3 are members arranged in correspondence to the protruded portion pressurizing surfaces 121b, 121b of the actuator 102, and are rotatably supported to the cam shaft 4, respectively.
  • torsion coil springs 5, 5 are mounted to return the restricting plates 2, 3 to the initial condition (position shown in FIG. 4 and FIG. 5), respectively.
  • One end of this torsion coil spring 5, 5 is fixed to the support frame 11 and the other end to the restricting plates 2, 3.
  • each of the restricting plates 2, 3 relief holes 2a, 3a of the cam follower pin 6 are formed, and at the edge portion of the holes 2a, 3a, notches 2b, 3b for restricting the move of the cam follower pin 6 are formed.
  • Each of the notches 2b, 3b is machined in a semicircular profile to allow the cam follower pin 6 to fit in as shown in FIG. 8, and when each of the restricting plates 2, 3 is in the initial condition (condition shown in FIG. 5 and FIG. 6), the notches are located ahead of the moving direction of the cam follower pin 6 (see FIG. 9 (A)).
  • the driving cam 1 and restricting plates 2, 3 are arranged in such positional relationship that generates a rotating phase difference between them that corresponds to the level difference between the recessed portion pressurizing surface 121a and the protruded portion pressurizing surface 121b of the actuator 102.
  • the restricting plate 3 located on the left side as seen from the insertion hole 101a side of the operating portion 111 does not appear in the figure and no reference character is designated, but since in this example, a pair of restricting plates 2 and 3 make the similar motion, they are designated to the restricting plates 2, 3 in the following description of operation.
  • both the driving cam 1 and restricting plates 2, 3 rotate in response to this, and the cam follower pin 6 advances along the groove cam 1c and the operating rod 8 advances along with it, and at the same time, the notches 2b, 3b of the restricting plates 2, 3 come off from the moving path of the cam follower pin 6 [FIG. 9 (B)], and thereafter, the actuator 102 further advances and when it reaches the insertion end, the connection contact is changed over and at the same time the pressurizing piece 121 of the actuator 102 fits into the recessed portion la of the driving cam 1 as shown in FIG. 9 (C).
  • the driving cam 1 will not rotate. That is, as shown in FIG. 11, when the driving cam 1 and the restricting plates 2, 3 are in the initial condition shown in FIG. 11 (A), the cam follower pin 6 is located at the position free of interference with the notches 2b, 3b of the restricting plates 2, 3, and even if the restricting plates 2, 3 are pressed to rotate by the pressurizing plate D, the restricting plates 2, 3 only rotate as shown in FIG. 11 (B), and the driving cam 1 is free of application of any force and is held to a standstill.
  • the movement of the cam follower pin 6 is restricted by notches 2b, 3b, but this invention shall not be restricted to this, but for example, an engaging piece in the form of hook or key (L-letter shape) the cam follower pin 6 hitches may be formed integrally to the restricting plates, or any other optional construction may be adopted as long as it comes in contact with the cam follower pin 6 and can restrict its move.
  • torsion coil spring 5 As a means for returning the restricting plates 2, 3 to the initial condition, an example of using torsion coil spring 5 was shown, but in addition to this, generally applied elastic members such as tension coil springs or plate springs may be applied.
  • FIG. 13 (A) When the compression coil spring is used, for example, as shown in FIG. 13 (A), engaging pieces 12c, 13c are installed to the restricting plates 12, 13, and between this engaging piece 12c, 13c and the engaging portion S1 installed on the cover side, a compression coil spring 15 is inserted, and by the compression coil spring 15 which is compressed by the rotation of the restricting plates 12, 13, the restoring force to the initial condition can be obtained as shown in FIG. 13 (B).
  • FIG. 16 (A) As the other example using the plate spring, as shown in FIG. 16 (A), a configuration may be adopted, in which plates springs 42d, 43d are formed integrally to the restricting plates 42, 43, and the recovering force can be obtained by allowing this plate springs 42d, 43d to deflect as shown in FIG. 16 (B).
  • FIG. 17 is a perspective showing the application condition of a second embodiment of the present invention
  • FIG. 18 and FIG. 19 are block diagrams of the second embodiment, which are a plan view and a side view with the cover removed, respectively.
  • FIG. 20 is a plan view showing the operating portion 211 and the solenoid mechanism portion 213 with the cover removed
  • FIG. 21 is a cross-sectional view taken on line X--X of FIG. 20.
  • the driving cam 1 that rotates in response to the advance and retraction of the actuator 102, restricting plates 2, 3 rotatably supported to the cam shaft 4 of the driving cam 1, and the groove cam 1c of the driving cam 1 are inserted in the same manner as in the case of the previous embodiment, in which the cam follower pin 6 connected to the end portion of the operating rod 8, torsion coil springs 5, 5, etc. for returning each of the restricting plates 2, 3 to the initial condition are installed.
  • a lock stepped portion 1d (see FIG. 22) is formed, and at the location above the driving cam 1 and the restricting plates 2, 3, a lock lever 50 is placed.
  • the lock lever 50 is a member with the engaging piece 50a, arm 50b supporting both ends, and operating piece 50c supporting the arm ends integrally formed, and is constructed to enable the engaging piece 50a to come in contact as pressed against the exterior circumferential surface of the driving cam 1 by the elastic force of the compression coil springs 51, 52 placed at two places, right and left, respectively.
  • the solenoid mechanism portion 213 is equipped with a lock canceling mechanism 60 for canceling the lock mechanism (lock lever 50) of the operating portion 211 and a solenoid 90 for generating the canceling force.
  • the lock canceling mechanism 60 comprises an operating rod 61 connected to the tip end portion of the plunger 90a of the solenoid 90, an operating plate 62 securely fixed to the tip end portion of the rod 61 with a machine screw 63, and a compression coil spring 64, etc.
  • the end portion on the side of the operating portion 211 of the operating plate 62 comes in contact with the front side of the lower end portion of the operating piece 50c of the lock lever 50, and in response to the movement of this operating plate 62, the lock lever 50 is constructed to swing.
  • a microswitch 10 that opens and closes in response to the move of the plunger 90a of the solenoid 90 is installed.
  • This microswitch 10 is a switch that is normally closed and opens when the solenoid 90 is excited, and as shown in the circuit block diagram of FIG. 23 (A), (B), (C), is connected to the main circuit (power supply feed circuit to the industrial machinery) to which connection contacts of the contact block 9 on the switch portion side to be in series to the connection contact.
  • FIGS. 22(A)-22(C) The operation of the second embodiment of the invention of the above configuration is described referring to FIGS. 22(A)-22(C).
  • the actuator 102 advances the inside of the operating portion 211 through the insertion hole 201a, first of all, the recessed portion pressurizing surface 121a and the protruded portion pressurizing surfaces 121b, 121b at the tip end come in contact with the driving cam 1 and the restricting plates 2, 3, respectively [FIG. 22 (A)].
  • the cam follower pin 6 does not move and is located at the end on the cam shaft 4 side of the groove cam 1c of the driving cam 1.
  • both the driving cam 1 and restricting plated 2, 3 rotate in response to this, and the cam follower pin 6 advances along the groove cam 1c and the operating rod 8 advances along with it, and at the same time, the notches 2b, 3b of the restricting plates 2, 3 come off from the moving path of the cam follower pin 6, and thereafter, the actuator 102 further advances and when it reaches the insertion end, the connection contact is changed over and at the same time the pressurizing piece 121 of the actuator 102 fits into the recessed portion la of the driving cam 1 as shown in FIG. 22 (B).
  • the engaging piece 50a of the lock lever 50 displaces to the position to hitch the lock stepped portion 1d of the driving cam 1 by the pressurizing force of the compression coil springs 51, 52, and the rotation in the returning direction (clockwise) of the driving cam 1 is blocked by this. Consequently, even when the force in the pulling out direction is exerted to the actuator 102 to open the door 103, the pressurizing piece 121 hitches the recessed portion la of the driving cam 1 under the rotation blocking state and pull-out of the actuator 102 is prevented.
  • FIG. 24 (A) is a plan view of a third embodiment of the present invention
  • FIG. 24 (B) the side view
  • FIG. 25 a longitudinal cross sectional view of the third embodiment.
  • This embodiment is characterized by the key operating portion 70 installed to the top cover 213a of the solenoid mechanism portion 213 in the safety switch (with lock mechanism) of the construction shown in FIG. 17-FIG. 22.
  • the key operating portion 70 comprises a rotating member 72 that rotates in response to the insertion and rotation of a specific key 71 and a cam 73 securely fixed to its lower end portion.
  • the cam 73 is a member whose inner surface is machined to a specified radius as shown in FIG. 26, and it is configured in such a manner that to the inner surface of the cam 73, a cam follower pin 61a installed to the rear end portion (tip end portion of the plunger 90a of the solenoid) of the operating rod 61 of the lock canceling mechanism comes in contact, and as the rotating member 72 rotates by the key operation, the cam 73 rotates around the center axis 72a of the rotating member 72 to move the operating rod 61.
  • FIG. 26 (A) shows the locked condition of the actuator 102 and FIG. 26 (B) the lock canceled condition thereof.
  • FIG. 27 (A) is a plan view of a fourth embodiment of the present invention
  • FIG. 27 (B) the side view
  • FIG. 28 the longitudinal cross-sectional view of the fourth embodiment.
  • the fourth embodiment is characterized by integrally installing the cylindrical form receiving seat 8 to the top cover 213a of the solenoid mechanism portion 213 and inserting and arranging the plug receiver 80 to this receiving seat 82 in the safety switch (with lock mechanism) of the construction shown in FIG. 17-FIG. 22.
  • the plug receiver 80 is a member in which the pin insertion hole 82a for inserting the pin 81a of the insertion plug 81 later described is installed at the position opposite to each other with the center in-between, and is rotatably placed with the cylindrical shaft as a center in the receiving seat 82, and to the lower end portion of this plug receiver 80, the cam 73 is securely fixed.
  • the cam 73 has the same profile as that shown in FIG. 26, to the inner surface of which the cam follower pin 61a installed to the operating rod 61 of the lock canceling mechanism is in contact, and is constructed to rotate in response to the rotation of the plug receiver 80 by the plug operation (see FIG. 26) to move the operating rod 61.
  • the insertion plug 81 comprises a plug frame 81b and a pin 81a integrally installed to this as shown in FIG. 28.
  • the plug frame 81b is removable attached to the receiving seat 82 by the so-called bayonet joint construction, which comprises a protrusion 82c provided to the receiving seat 82 and a groove 81c that fits into this, and is mounted by the insertion and rotation of the receiving seat 82 and is removed from the receiving seat 82 in the reverse procedure as shown in FIG. 27 (B).
  • the manual lock canceling means by the key operation or plug operation as described above may be installed independently to the switch proper 201 without combining the solenoid 90.
  • the operating portion 211 and switch portion 212 and the solenoid mechanism portion 213 are made integral, but this invention shall not be restricted to this but it is possible to take a form in which the safety switch is divided into a switch proper unit equipped with the operating portion and the switch portion and a unit equipped with the solenoid mechanism portion as shown in FIG. 1 and these switch proper unit and the solenoid unit are connected to form a safety switch.
  • FIG. 31 is a cross-sectional view showing the operating portion, which is the essential configuration of this example
  • FIG. 32 is a side view showing the applied condition of this example
  • FIG. 33 is a view on arrow Z in FIG. 32
  • FIG. 34 a perspective showing the construction of the releasing lever 313 using in this example
  • the end portion of the machine screw 63 that securely fixes the operating plate 62 to the operating rod 61 of the solenoid is designed to pass through the operating rod 61 and come close to the bottom wall 201c, and the machine screw 63 is configured to be used as a lock canceling pin, and at the same time, a canceling lever 313 for moving the machine screw 63 is installed.
  • the canceling lever 313 comprises a lever piece 313a for pressurizing the machine screw 63, rotating shaft 313b that serves as a fulcrum, and an operating portion 313c equipped with a handle 313d, as shown in the perspective of FIG. 34, and as shown in FIG. 31, the rotating shaft 313b is rotatably supported around the axis parallel to the center of the machine screw 63 to the bottom wall 201c of the switch proper 201.
  • the safety switch equipped with a canceling lever 313 of this kind of construction that is, the operating portion 313c has a construction to expose to the fixing surface side (rear surface side) of the switch proper 201, can be operated from the inside of the machine room by keeping the operating hole 103c open of the door 103 as shown in FIG. 32 and FIG. 33.
  • the end portion of the machine screw 63 is constructed to come closer to the lower side of the operating rod 61 and to be used for a lock canceling pin, but this invention shall not be restricted to this construction, and it may be constructed to use the machine screw 63 as a component specialized for securely fixing the operating plate 62 to the operating rod 61, to integrally form a protruding piece on the lower side of the operating rod 61, and to use this protruding piece for a lock canceling pin.
  • canceling means it is possible to adopt a construction to equip an engaging recessed portion to the lower surface side of the operating rod 61 as well as a protruded portion at the canceling lever 313, and to hitch the protruding portion on this lever side to the engaging recessed portion on the rod side, and to manually cancel the lock mechanism of the actuator 102 by hitching a tip end of the screwdriver or other tool to the rod side engaging recessed portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Lock And Its Accessories (AREA)
  • Push-Button Switches (AREA)
US09/049,098 1997-03-31 1998-03-27 Safety switch Expired - Lifetime US6118087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/397,009 US6194674B1 (en) 1997-03-31 1999-09-15 Safety switch

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP9-080265 1997-03-31
JP8026597 1997-03-31
JP9-112260 1997-04-30
JP11226097A JPH10302580A (ja) 1997-04-30 1997-04-30 安全スイッチ

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/397,009 Division US6194674B1 (en) 1997-03-31 1999-09-15 Safety switch

Publications (1)

Publication Number Publication Date
US6118087A true US6118087A (en) 2000-09-12

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
US09/049,098 Expired - Lifetime US6118087A (en) 1997-03-31 1998-03-27 Safety switch
US09/397,009 Expired - Lifetime US6194674B1 (en) 1997-03-31 1999-09-15 Safety switch

Family Applications After (1)

Application Number Title Priority Date Filing Date
US09/397,009 Expired - Lifetime US6194674B1 (en) 1997-03-31 1999-09-15 Safety switch

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US (2) US6118087A (de)
EP (1) EP0869524B1 (de)
DE (1) DE69837736T2 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6307167B1 (en) * 1998-07-30 2001-10-23 Omron Corporation Key switch
US6310305B1 (en) * 1999-01-14 2001-10-30 Idec Izumi Corporation Safety switch
US20040069602A1 (en) * 2002-06-19 2004-04-15 Medi Mohtasham Lockable switch mechanism
US20060124439A1 (en) * 2004-10-07 2006-06-15 Denso Corporation Wireless device having a battery selectively activated
US20070209404A1 (en) * 2006-03-09 2007-09-13 Omron Corporation Key switch
US20080164129A1 (en) * 2007-01-05 2008-07-10 Derek Jones Safety Switch Mounting
US20120175228A1 (en) * 2008-12-02 2012-07-12 Idec Corporation Safety switch
US20120247162A1 (en) * 2011-04-01 2012-10-04 Idem Safety Switches Limited Anti-Tamper Cam System
US20120247931A1 (en) * 2011-04-01 2012-10-04 Idem Safety Switches Limited Anti-Tamper Safety Switch System with Guard Locking
USD742840S1 (en) * 2013-11-13 2015-11-10 Rockwell Automation Technologies, Inc. Industrial control
US10861660B2 (en) 2017-02-24 2020-12-08 Idec Corporation Safety switch
US11087933B2 (en) 2018-01-11 2021-08-10 Idec Corporation Safety switch

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Publication number Priority date Publication date Assignee Title
US6720508B2 (en) * 2001-07-06 2004-04-13 Omron Corporation Door switches
US7107464B2 (en) * 2001-07-10 2006-09-12 Telecom Italia S.P.A. Virtual private network mechanism incorporating security association processor
ITVI20030090A1 (it) * 2003-04-29 2004-10-30 Pizzato Elettrica Srl Interruttore di sicurezza con dispositivo di sblocco dell'azionatore.
GB0405543D0 (en) 2004-03-10 2004-04-21 Eja Ltd Switch mechanism
JP4396478B2 (ja) * 2004-10-21 2010-01-13 オムロン株式会社 キースイッチ
JP4522291B2 (ja) * 2005-03-08 2010-08-11 Ｉｄｅｃ株式会社 安全スイッチ
JP4673661B2 (ja) * 2005-04-26 2011-04-20 Ｉｄｅｃ株式会社 安全スイッチ
JP4727290B2 (ja) * 2005-05-11 2011-07-20 Ｉｄｅｃ株式会社 安全スイッチ
GB0515583D0 (en) * 2005-07-29 2005-09-07 Eja Ltd Safety switch operating mechanism
JP4710648B2 (ja) * 2006-02-23 2011-06-29 オムロン株式会社 安全スイッチ
EP1876622B1 (de) * 2006-07-03 2010-09-29 Siemens Aktiengesellschaft positionsschalter
DE102010007388A1 (de) * 2010-02-02 2011-08-04 Pilz Auslandsbeteiligungen GmbH, 73760 Verrieglungseinrichtung mit Zuhaltung für Schutztüren
CN105118708A (zh) * 2015-09-21 2015-12-02 金方明 一种大型石材切割机设备开关传动件
CN107539846B (zh) * 2017-08-16 2023-07-18 曾培强 一种无线解锁的操作杆安全锁

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DE29515529U1 (de) * 1995-09-29 1996-01-11 Elan Schaltelemente GmbH, 35435 Wettenberg Verriegelungseinrichtung
US5622253A (en) * 1994-10-13 1997-04-22 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Safety switch

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EP0117396A1 (de) * 1983-01-27 1984-09-05 Hans & Jos. Kronenberg GmbH Sicherheitsschalter mit Fehlschliesssicherung
EP0330229A2 (de) * 1988-02-26 1989-08-30 Elan Schaltelemente GmbH Verriegelungsvorrichtung
US5464954A (en) * 1992-08-31 1995-11-07 Idec Izumi Corporation Safety switch assembly
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6307167B1 (en) * 1998-07-30 2001-10-23 Omron Corporation Key switch
US6310305B1 (en) * 1999-01-14 2001-10-30 Idec Izumi Corporation Safety switch
US20040069602A1 (en) * 2002-06-19 2004-04-15 Medi Mohtasham Lockable switch mechanism
US6872898B2 (en) * 2002-06-19 2005-03-29 Eja Limited Lockable switch mechanism
US20060124439A1 (en) * 2004-10-07 2006-06-15 Denso Corporation Wireless device having a battery selectively activated
US7138589B2 (en) * 2004-10-07 2006-11-21 Denso Corporation Wireless device having a battery selectively activated
US7504597B2 (en) * 2006-03-09 2009-03-17 Omron Corporation Key switch
US20070209404A1 (en) * 2006-03-09 2007-09-13 Omron Corporation Key switch
US20080164129A1 (en) * 2007-01-05 2008-07-10 Derek Jones Safety Switch Mounting
US7563995B2 (en) * 2007-01-05 2009-07-21 Rockwell Automation Limited Safety switch mounting
US20120175228A1 (en) * 2008-12-02 2012-07-12 Idec Corporation Safety switch
US9064656B2 (en) * 2008-12-02 2015-06-23 Idec Corporation Safety switch
US20120247162A1 (en) * 2011-04-01 2012-10-04 Idem Safety Switches Limited Anti-Tamper Cam System
US20120247931A1 (en) * 2011-04-01 2012-10-04 Idem Safety Switches Limited Anti-Tamper Safety Switch System with Guard Locking
US8658927B2 (en) * 2011-04-01 2014-02-25 Idem Safety Switches Limited Anti-tamper safety switch system with guard locking
US8803013B2 (en) * 2011-04-01 2014-08-12 Idem Safety Switches Limited Anti-tamper cam system
USD742840S1 (en) * 2013-11-13 2015-11-10 Rockwell Automation Technologies, Inc. Industrial control
US10861660B2 (en) 2017-02-24 2020-12-08 Idec Corporation Safety switch
US11087933B2 (en) 2018-01-11 2021-08-10 Idec Corporation Safety switch

Also Published As

Publication number Publication date
DE69837736T2 (de) 2008-01-10
EP0869524B1 (de) 2007-05-09
EP0869524A1 (de) 1998-10-07
DE69837736D1 (de) 2007-06-21
US6194674B1 (en) 2001-02-27

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